Is the word "Easter" in the King James Version a mistranslation?

"And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people." -- Acts 12:4, KJV "So when he had arrested him, he put him in prison, and delivered him to four squads of soldiers to... show more "And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people." -- Acts 12:4, KJV

"So when he had arrested him, he put him in prison, and delivered him to four squads of soldiers to keep him, intending to bring him before the people after Passover." -- Acts 12:4, New King James Version (NKJV)

Where does the word "Easter" come from?
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